LibLocale: Prepare locale data generator for breaking changes in CLDR 43

In CLDR 42 and earlier, we were able to assume all cldr-localename files
existed for every locale. They now do not exist for locales that don't
provide any localized data. Namely, this is the "und" locale (which is
an alias for the root locale, i.e. the locale we fall back to when a
user provides an unknown locale).

Further, we were previously able to assume that each currencies.json in
cldr-numbers contained all currencies. This file now excludes currencies
whose localized names are the same as the currency key. Therefore, we
now preprocess currencies.json to discover all currencies ahead of time,
much like we already do for languages.json.

1 files changed, 72 insertions, 0 deletions

diff --git a/Tests/LibLocale/TestLocale.cpp b/Tests/LibLocale/TestLocale.cpp
index 7300faddac..754a819698 100644
--- a/Tests/LibLocale/TestLocale.cpp
+++ b/Tests/LibLocale/TestLocale.cpp
@@ -518,3 +518,75 @@ TEST_CASE(supports_locale_aliases)
     EXPECT(Locale::is_locale_available("zh-TW"sv));
     EXPECT(Locale::is_locale_available("zh-Hant-TW"sv));
 }
+
+TEST_CASE(locale_mappings_en)
+{
+    auto language = Locale::get_locale_language_mapping("en"sv, "en"sv);
+    EXPECT(language.has_value());
+    EXPECT_EQ(*language, "English"sv);
+
+    language = Locale::get_locale_language_mapping("en"sv, "i-defintely-don't-exist"sv);
+    EXPECT(!language.has_value());
+
+    auto territory = Locale::get_locale_territory_mapping("en"sv, "US"sv);
+    EXPECT(territory.has_value());
+    EXPECT_EQ(*territory, "United States"sv);
+
+    territory = Locale::get_locale_territory_mapping("en"sv, "i-defintely-don't-exist"sv);
+    EXPECT(!territory.has_value());
+
+    auto script = Locale::get_locale_script_mapping("en"sv, "Latn"sv);
+    EXPECT(script.has_value());
+    EXPECT_EQ(*script, "Latin"sv);
+
+    script = Locale::get_locale_script_mapping("en"sv, "i-defintely-don't-exist"sv);
+    EXPECT(!script.has_value());
+}
+
+TEST_CASE(locale_mappings_fr)
+{
+    auto language = Locale::get_locale_language_mapping("fr"sv, "en"sv);
+    EXPECT(language.has_value());
+    EXPECT_EQ(*language, "anglais"sv);
+
+    language = Locale::get_locale_language_mapping("fr"sv, "i-defintely-don't-exist"sv);
+    EXPECT(!language.has_value());
+
+    auto territory = Locale::get_locale_territory_mapping("fr"sv, "US"sv);
+    EXPECT(territory.has_value());
+    EXPECT_EQ(*territory, "États-Unis"sv);
+
+    territory = Locale::get_locale_territory_mapping("fr"sv, "i-defintely-don't-exist"sv);
+    EXPECT(!territory.has_value());
+
+    auto script = Locale::get_locale_script_mapping("fr"sv, "Latn"sv);
+    EXPECT(script.has_value());
+    EXPECT_EQ(*script, "latin"sv);
+
+    script = Locale::get_locale_script_mapping("fr"sv, "i-defintely-don't-exist"sv);
+    EXPECT(!script.has_value());
+}
+
+TEST_CASE(locale_mappings_root)
+{
+    auto language = Locale::get_locale_language_mapping("und"sv, "en"sv);
+    EXPECT(language.has_value());
+    EXPECT_EQ(*language, "en"sv);
+
+    language = Locale::get_locale_language_mapping("und"sv, "i-defintely-don't-exist"sv);
+    EXPECT(!language.has_value());
+
+    auto territory = Locale::get_locale_territory_mapping("und"sv, "US"sv);
+    EXPECT(territory.has_value());
+    EXPECT_EQ(*territory, "US"sv);
+
+    territory = Locale::get_locale_territory_mapping("und"sv, "i-defintely-don't-exist"sv);
+    EXPECT(!territory.has_value());
+
+    auto script = Locale::get_locale_script_mapping("und"sv, "Latn"sv);
+    EXPECT(script.has_value());
+    EXPECT_EQ(*script, "Latn"sv);
+
+    script = Locale::get_locale_script_mapping("und"sv, "i-defintely-don't-exist"sv);
+    EXPECT(!script.has_value());
+}